Island



F. L. SIMMONS MAGNETI C CHUCK Nov. 25, 1924- 1,517,025

F. L. SIMMONS MAGNET I C CHUCK Filed June 7, 1919 3 Sheets-Sheet 2 I y N F. L. SIMMONS MAGNETIC CHUCK Filed June '7, 1919 3 Sheets-Shoot 3 Patented Nov. 25, 1924.

UNITED STATES PATENT OFFICE.

FRANK L. SIMISIONS, 0F WOONSOCKET. RHODE ISLAND. ASSIGNOB TO THE TA FT- YEIRCE MANUFACTURING COMPANY. PORATION OF RHODE ISLAND.

OF WOONSOCKET, RHODE ISLAND, A COR- MAGNETIC CHUCK.

Application filed June 7, 1919.

To (I l ho: if may concern:

Be it kn wn that l FRANK L. Snnroxs a citizen of the United States, residing at \i'mmsoeket, in the county of Providence, State of llhodc Island, have invented certain new and useful Improvements in Magnetic Chucks. of which the following is a specification.

This invention relates broadly to electrical apparatus and more specifically to magnetic chucks and the like.

The principal object of the present invention is to provide a magnetic chuck adapted more especially for work requiring'a uni versal chuck. v

Another object of the present invention is a magnetic chuck of the character specified and wherein the poles on the chuck are arranged to be especially applicable to holding work supported by built-up supports;

Another object of the present invention a chuck of the character specifiedhavin a substantially rectangular work face port on with certain pole pieces arranged longitudinally thereof and certain other 'of the pole pieces arranged transversely thereof whereby the face plate isadapted to hold work of various charactersi Another and principal object 'of'the present invention is a face'plate'itaving the pole pieces thereof magnetically insulated one from another by a phenol condensation'prodnet and with reinforcing ribs or members adapted to support the said insulation between the pole pieces.

iriore specifically an object of the present invention comprises a face plate having a. plurality of pole pieces separated one from another by non-magnetic members of bakelite, condensite, or thejlike, and with framiug ribs of the face plate constructed to support the said non-magnetic insulating members.

Another and important object of the present invention is a magnetic chuckhaving a plurality of work face pole pieces and with an adjustable back strip arranged adjacent one edge of the work face and parallel to certain of said pole pieces and with the said back strip being adjustable vertically and horizontally whereby an adjustable abutmeut is provided for setting the work on the pole pieces of the face of the chuck.

Another important object of the pregi nt.

Serial No. 302,560.

invention is a magnetic chuck of the character. specified having an aluminum body and frame provided with a t minal box.

having a cast aluminum cap adapted to'be seated with a water-tight joint against "the face of the body of the chuck for wet grin dmg.

The present invention possesses many other advantageous features some of which, together with the foregoing; be set 'out more at length in the' followin description wherein will.- be outlined iii"ful that form of the invention Iwhili'T have s elected for illustration in the drawings swam s-spri and forming a part of this i In the drawings I have shofioiflifbne specific form ofmyenric invention bnt itis to be understoo' fthat I do"not-'l.imit myself to such fornr" becapse my invention may embodied in a'innltip'licit'y of farms, each being-.-'-species army mventi n. -It is also to be 'undfitood'thatliy t tila-ims siicform it ay be "f' Refe'rence iio'ii be niad t6' ,tlie drawin'g's' whereiii like chaizicter's'fire'fisdtd ref resentlike parts thromzhout the several'fiaures thereof."

' Figure-1 is a planyiew ofonp'nibodimefit of my inventionwith theba'ckfsti'i p ilidsupporting bolts therefor'fre noyed.

Figure 2 is 'an eleyationa1"v1ew ofthe device shown in Figliri'f pndwith 'diie-half of the deviceshown'inflon "tudinall' section.

Figure 3-isan end new -ptli devices'hbwing the back strip in'plac' andshowing 'a section of the face plate'taken on line A;A of Fig\ ]I"e'2' e i Figure14'i'sh'detail of a portioiiof the --adju"stment' mechanism for adjusti ng"thje back strip horizontally. Figure 5 isdtail' view"st owing the adjustment mechanismfor the back'st'ripi I Figure 6 is a plan view of the 'te'rminal block showing a. portion of the 'blbck in section. i

Figure 7 is a lon itudinal section of the terminal block showing the same in position on the side Wall of the body portion of the chuck- Heretofore in the art of rectangularfinagnetic chucks it has been customary't'o arrange the pole pieces transversely-of theface of the chuck since this arrangement gives greater holding power for holding flat pieces extending longitudinally of the chuck.

In the majority of cases rectan ular chucks are used on macl'ne tools witli the. length of the chuck parallel to the length of the bed of the tools so that the displacement forces acting on the work are in mo t cases lengthwise of the chuck and it is desirable to obtain the greatest holding power against such forces.

It frequently becomes desirable, particularly in a small shop, to build up supports for Work by using parallels and then laying the work upon the parallels. To facilitate this it is desirable that the pole pieces be variously arranged, and for a rectangular chuck one of the most convenientarrangements comprises arranging: certain pole pieces transversely of the chuck face andother pole pieces longitudinally. It is also possible to build up work upon groups of longitudinally extending, pole pieces whereby exceedingly strong magnetic. fields between the builtfu-p members are obtained.

Heretofore in the art of magnetic chuck it has been customary to utilize Babbitt metal or other soft metal as non-magnetic fillers between the pole pieces. This soft metal tends to wear away and therefore leavesthe face uneven it also tends to hold particles of emery or carborundum so that they scratch or mar fine work. In the present case the object-ions to such material are overcome by using a phenol condensation. product, for example, condensite or the like- The spacing members between tbc poles are supported by ribs which comprise a portion of the face plate frame so that a substantial grid. of supportingmetal isprovided by thefaice plate frame. Preferably the face plate frame is of non-magnetic metal, such as aluminum, and therefore no magnetism is lost by shortcircuiting due to the ribs or grid members QXtQflC-llflg between. the pole pieces.

Miagnetic chucks are frequently used for wet grinding and waterproofing becomes more or less of a problem. The present invention comprises a thoroughly water proof housing for the cores by providing a strip of tin or brass which extends over the tops of the pole pieces and beneath the face plate, and by further providing an aluminum cap box for the terminal block The aluminum cap box has sullicient stren th to permit it to be. firmly or securely seated against the side of the body of the chuck and provides a water-tight joint at this juncture.

Referring now to the drawings, the chuck comprises a housing 1 which preferably is an open box having integral sides and. luv!- tom, and in the preferred form is made of aluminum. This housing or body is pro vided with lifts 2 which are adapted to carry the core casting 4. This core casting 4 preferably is of special magnet steel and is provided with a base 5 that carries a pinrality of core pole pieces 6 which are sul stantially flat platelike members extending upwardly, and preferably integral with the base. These core pole pieces are arranged in groups to correspond to the arrangement of the face plate pole pieces which will later be described. Each core pole piece carries an individual magnetizing coil 7 whereby the pole pieces are suitably energized. The upper ends of the core pole pieces and the upper edges of the housing or body are ground to lie in a common plane thereby insuring a good contact with the I work face pole pieces. Preferably a waterproofing sheet 8 is arranged over the upper ends of the core pole pieces and extends over the edges of the sides thereby forming;

a complete cover for the pole pieces and coils. This sheet is of thin material, but is shown in the drawings in exaggerated thickness to more clearly illustrate the same.

A face plate is adapted to be supported on the core pieces and the sides of the housing.

This face plate comprisesa frame 9 in which the face plate pole pieces are maintained. Certain of the face plate pole pieces 10 extend transversely of the face plate and certain other of the face plate pole pieces 11 extend longitiu-linally of the face plate.

Transverse ribs 12 extend across the face plate frame and between the underportion of certain of the face plate pole pieces. Longitudinal-1y extending ribs 14 likewise extend between certain other of the face plate pole pieces. The ribs 14 together with the ribs 12 and the face plate frame comprise a grid in. which the face late pole pieces set. Pre ferably this grid 18- made of non-magnetic metal which in the preferred form is aluminum. By making this grid of non-magnetic metal the danger of short-circuiting pole pieces by means of the ribs 12 and 14 is obviated.

The spaces betw en the. face. plate pole pieces are preferably filled with bakelitc. condensite, or other hard phenol composition, and comprise insulating spacers 1:3.

Both the upper and lower surfaces of the face plate comprise plane surfaces and. preferably these are parallel. A plurality of through bolts 16 extend upwardly through suitable openings in the sides of the housing and through openings in the waterproofing sheet 8, and are threaded or tapped into the face plate frame, whereby the face plate is tightly clamped in position on the housing.

It is desirable to provide a detachable terminal block in order to facilitate the comlll) [all

plot-ing of the electrical connections, and a preferred form of terminal block is illustrated in Figures 6 and 7. The terminal wires from the coils 7 are brought through openings 17 in the block base 18 and are clamped by the binding screws 19. This terminal block base 18 preferably is a molded bakelitc or condensitc member and is firmly seated against the sidz.- of the housing 1 by machine screws 20. A cover cap comprising an aluminum castin 21 is provided with a terminal conduit member 22 and is constructed with upstanding lugs 24 that carry an insulating tiber plate 25 which is secured in position on the lugs by means of the stub screws 26. This fiber plate carries a pair of terminal spring fingers 27 and 28 which are adapted to be connected with the lead wires through which electricalenerg Y is to be'supplied. This cover cap 21 is held in position against the chuck body by stub screws 29 and preferably a water-tight gasket or packingfl30 of suitable material such asv that known under the trade name of vellumoid is provided between the edges of the. cover cap 21 and the side wall of the, body 1... The positioning of the cap against the side of the body automaticallybrings the terminal fingers 27 and 28 into. engagement with the bindingscrews l9.so ;thatwhen the cap-is in position: the electric circuit with the feed cableis completed.- A water shed 31 also prevents a. certain amount of water from reaching the cover cap andfurtherassists .the waterproofing.

- In a chuck ofthis character it is particularly-desirable-that a universally adjustable back plate be provided as the operation of the back plate is -thereby facilitated byproviding for horizontalas well as vertical adjustments. This back plate is illustrated in Figures 3, 4,;and 5, and comprises a rest support 32 which has bifurcated arms 34 that'are adapted to extend over stub bolts 35 and to be clamped in predetermined vertical adj listed-positions by means of the said stub bolts. The upper portion of the rest support is grooved as at 36 to provide guideways for the guide blocks 37 which are secured to the underportion of the back strip 38 and guide the longitudinal-movements of the strip. Adjustment screws 39 are set in the rest support 32 and theheads of these screws engage recesses 40 in the back strip 38 so that by turning these adjustment screws the back strip may be moved over the chuck face. IVhen a predetermined adj ustment has been made, the back strip may be clamped in adjusted position by the screws 41 and 42 which cause the guide blocks to be clamped against the upper portions of the grooves 36. It is important that this back plate shall be non-magnetized, otherwise work which has been released from the chuck may Stick to the back plate thereby requiring special care in removing the work. lVhere the back plate is magnetized, the unexpected holding power has been the cause of workmen dropping work, thereby injuring both the work and the chuck. In the construction herein illustrated the non-magnetic character of the back plate is secured by mounting the rest support 32 for the plate upon and against the non-magnetized housing 1.

From the foregoing it will be noted that the chuck comprising the present invention, because of the arrangement of the face plate pole pieces, is particularly adapted for use on a multitude of different types of work, and is particularly useful in small shops which use a magnetic chuck for a plurality of purposes.

Having thus described my what I claim is:

1. Ina magnetic chuck or the like, the combination of a housing, electro-magnetic energizing means within said' housing, a face plate covering said housinga said face plate comprising aframe and individual pole pieces .within -said :frame,isaid:pole pieces having. undercut portions;v non-magnetic materialisep'arating 'said pole pieces invention.

onefrom another, and-reinforcing means ex; vtending through said non-magnetic material.

2. In 'a. magnetic chuck or the like, the combination of a housing, electro-magnetic energ1zmg means withinv said housing, a

face platecovering said housing said faceplate comprising a frame and individual pole pieces within said frame, said pole pieces having undercut portions, a hard phenol condensation material separating, said pole pieces one from another, and reinforcing means extending through said co n densation material.

In a magnetic chuck-or the like, the combination of a housing, .electro-magnetic energizing means within said h'ousing,a face plate covering said housing, said face plate comprising a frame and individual pole pieces within said frame, said pole pieces having- Iundercut portions, non-magnetic material separating said pole pieces one from another, and reinforcing ribs extending through said non-magnetic material, and beneath said pole' pieces.

4. Ina magnetic chuck or the like, the combination of a housing, electro-magnetic energizing means within said housing. a face plate covering said housing, said face plate comprising a frame and individual pole pieces within said frame, said pole pieces having undercut portions, non-magnetic material separating said pole pieces one from another, and reinforcing ribs ex tending through said non-magnetic material, said ribs and said frame being integral.

In a magnetic chuck or the like, the combination of a housing, electro-magnetic means within said housing, a face plate covering said housing, said face plate comprising a flame of non-magnetic material andindividual pole pieces within said frame, saidpole pieces having undercut portions, non-magnetic material separating said pole pieces one from another, and reinforcing ribs of non-magnetic material extending through said non-magnetic material.

(5. in magnetic chuck or the like, the combination of a housing, cleetro-magnetic energizing ill(lll]. within said housing, a face plate covering said housing, said face plate comprising a frame of non-magnetic material and individual pole pieces within said frame. said pole pieces having undercut portions, a hard phenol condensation member separting said pole pieces one from another, and reinforcing ribs of non-magnetie material extending through said eon densation material, said ribs'andsaid frame being integral.

7- A magnetic chuck and the like comprising a housing, eleetro-ma'gn'etic energizing means within said housing, a face plate covering said housing, said face plate comprising a plurality of individual pole pieces, aframe within which said pole i'eces are mounted, in combination witha dark strip so placed as to be magnetically unaffected by said energizing means and adapted to comprise an abutment against which work may be set over saidplate, means whereby'said back plate may be adjusted transversely of the face plate, and means to lock the back strip in adjusted positions.

8. A magnetic chuck and the-like comprising a housing. clectro-magnetic energizing means Within said housingfa substantially rectangular faceplate covering said housing, said face plate comprising a plurality of substantially rectangular ind-ividnal pole pieces, and a frame within which said pole pieces are mounted, in combination with a back strip so placed as to be magnetically unaffected by said energizing means and having an edge substantially par a-llel to certain of the pole pieces and adapt.- ed to comprise an abutment against which work may he set over said' face plate, and means \'lI.2'( said back plate may beadjusted transversely of said face plate.

9. magnel ic chuck and' the like comprising a housing ,n-orided with an opening in a wall thereof. clectro-niagnetic energizing means within said housing, a face plate; corering said housing, said face plate comprising a frame and a plurality of pole pieces supported within said frame. a waterproot ing sheet beneath said face plate and covering said housing. and a waterproof terminal box mounted over said opening and secured to one side wall of said housing by means of a waterproof joint whereby moisture is excluded from the interior of said housing 5 10. A magnetic chuck and the like comprising an aluminum housing having an opening in one side wall thereof, electromagnetic energizing means within said housing, a face plate comprising an aluminum frame and a plurality of pole pieces supported within said frame, a' waterproofing sheet beneath saidface plate and covering said housing, and an aluminum waterproof terminal box mounted over said opening and secured to one side wall of said housing by means of a waterproof joint whereby moisture is excluded from the interior of said housing.

11. A magnetic chuck and the like comprising a housing, electromagnetic means within said housing, aplurality of upright pole: pieces inoperative relation to said electromagnetic means, said pole pieces being substantially rectangular crux-section, certain of said-pole'pieces being disposed at rightangles to others thereof, and a substantially rectangular face plate covering said housing, said faceiplate comprising a plurality of face platepole" pieces substantially rectan hr in cros section' mounted directly" above said rectangnlar pole pieces with each of said'face plate polepieces disposed'in a d-irection- 'correspondin'g to the direction of its respective pole pieces.

12. A magnetic chuck and the, like comprising a honsin'g, electromagnetic "means witl'rinsaidi'housing, zv=sepa rate frame having" substantially' a rectangular. opening therein; 11- plurality-of independent pole p-iec'esin "said'housin substantially rectangular' jaceplatpo eieces mounted-in said frame above said p0 of pieces, a plural ity of longitudinal and transverse ribs'fomning a grid inwhich saidpole piecesset and nonmagnetic-means separating all'of said pole pieces from each'other and'from said frame.

"139A magnetic chuck andthe like comprising electro-ina-g netic means within said housing,- a plurality of lip-right pole pieces in operative relation to said magnetic means, a substantially rectangular face? plate covering said-housing, said face plate comprisingsubstantia'lly rectangular face plate'pol'c pieces, a framewithin'ivhich said'pole pieces are mounted, certaiuof said pole pieces extending transversely of said face plate and others extending longitudinally thereof, and non-magnetic material holding said pole pieces separated from each other and from said frame.

FRANK L. SIMTMON 

